Choice magazine and Consumer Reports provide the best comparison tests of the Energizer e2 Lithium batteries. Both publications compare the Energizer e2 with more than a dozen other batteries, but Consumer Reports tests only disposable batteries. PC World, PC Magazine and USA Today perform smaller comparison tests of the Energizer e2 Lithium batteries. We also find about two dozen useful owner-written reviews at Amazon.com.
For digital cameras, reviews consistently find Energizer e2 Lithium the best of the disposable batteries. They cost more than most disposables, but comparison tests show they last so long that each photo costs much less to shoot. Recovery time and flash power are also excellent. Lithium batteries are light, work well at low temperatures and have a shelf life of 10 years. The e2 batteries come in AA and AAA sizes, but they aren't recommended for low-drain devices such as remote controls or wall clocks. The main drawbacks are cost and the fact that lithium batteries give little or no warning before the charge runs out. For other electronics, reviews recommend the more cost-effective Sanyo eneloop rechargeable (*est. $10 per four-pack), which come pre-charged.
1. Choice magazine
Comparing 19 disposable and rechargeable batteries based on drain tests and value, Australia's Choice magazine gives top ranking to the Energizer e2 as the best disposable battery for devices such as digital cameras. They last longer in cameras than any of the other batteries tested, but they aren't recommended for low-drain devices such as remote controls.
Review: Test: High-Capacity Batteries, Editors of Choice magazine, June 2008
Consumer Reports compares Energizer e2 lithium batteries with 15 other disposable batteries, rating all 16 for performance in two protocols that simulate typical digital camera and CD player usage.
Review: Best Batteries, Editors of Consumer Reports, Nov. 2006
3. PC World
As part of a long article on getting the most out of batteries, PC World magazine tests four types of AA batteries, giving top rank to the Energizer e2 Lithium for runtime in digital cameras.
Review: Battery Boosters: Which AA Batteries Last Longer?, Christopher Null, Feb. 23, 2006
Testing seven brands of batteries, this review gives top ranking to Energizer e2 Lithium batteries as the most cost-effective disposable batteries for digital cameras, costing an average of one-fifth of a cent per photo. For powering low-drain devices such a flashlight or TV, however, regular alkaline batteries are more cost-effective.
Review: The New Power Generation, Troy Dreier, May 3, 2006
5. USA Today Magazine
Testing disposable batteries with a digital camera, this reviewer finds that Energizer e2 lithium batteries take more than twice as many photos as Duracell CopperTop batteries. The Energizer e2 batteries cost less per photo taken, but rechargeable batteries become even more cost-effective over time.
Review: Batteries Up! With More Power, Edward C. Baig, Feb. 1, 2006
More than 20 owners give the Energizer e2 Lithium batteries rave reviews here, praising their runtime and light weight. They do note, however, that while alkaline and rechargeable batteries fade gradually, lithium batteries give little to no warning before the device stops working.
Review: Energizer L91BP-4 AA Lithium Batteries (4-Pack), Contributors to Amazon.com